Pigment and paint.



. Be it known that I, 'nnmc, a citizen of the UNITED STATES ragrnnrr onnron.

OSCAR WARREN PICKERING, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO PICK- EBI'NG PAINT AND PI-GMENT COMPANY, A CORPORATION OF WEST VIRGINIA.

PIGMENT AND PAINT.

No Drawing.

To all whom it may concern:

OSCAR WARREN Pren- United States, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Pigments and Paints, of which the following is a specification.

This invention relates to a new pigment and paint thereof and has for some of its objects the production of a pigment or paint which will have, greater spreading power, less disintegratingor decomposing character when exposed to ingredients of or associated and better results,

with the atmosphere, more permanency or stability when exposed to light, and less specific gravity, whereby the settling out from the paint vehicle is prevented, and which will be more readily miscible with oils or other vehicles than such substances as white lead, contain less lead and produce greater and it comprises acompound or composition of lead with aluminum and oxygen in the form of lead aluminate 'or its equivalent and the same associated with a vehicle, such as a drying oil of the linseed type and in some cases with a diluent of drying nature such as turpentine, in the form of paint or similar commodity.

lVhen ordinary white lead! is employed in or as a paint associated with such vehi cles as linseed oil and turpentine the specific gravity of the lead compound or composition which comprises a lead carbonate and hydroxid (hydrate) in proportion of approximately two parts of the former to one part of the latter, or chemically 1 19. such thatit soon separates or settles out from mired paint and is hard to remix again to a uniform consistency. The lead com-- Pb canon a 1\ to:

Specification of Letters Patent.

Patented Oct. 1 3, 1914.

Application filed August 5, 1913. Serial No. 783,014.

acid recovered by treatment with a stronger acid such as sulfuric. The lead aluminate thus produced is thoroughly washed and dr ed, yielding a white product of superior nnxmg qualities with oils and producing a paint which readily spreads and presents a body covering of great light diffusive quality.

= It ,will be noted that the lead aluminate contains aluminum oxid in place of carbon ldioxid of the ordinary white lead which is more permanent and less affected by decomposing ingredients of the atmosphere and it more readily assimilates with oils or other paint vehicles and especially with drying oils, such as linseed, tang, and the like, or the same associated with driers such as turpentine. Instead of a pigment composed may be associated with lead hydroxid or hydrate corresponding to white lead except that the lead carbonate is*- substituted by .lead aluminate thus \Vhite lead, 2PbCO ,-Pb (OH) New pigment, 2PbAl.,O,;Pb(OH) This compound or composition of lead aluminate and lead hydroxid or hydrate may be produced by acting on a mixture of sodium aluminate and sodium hydroxid or hydrate with lead acetate whereby the two compounds, viz. lead aluminate and lead hydroxid (hydrate) are thrown down or precipitated from the aqueous solution of the compounds referred to in such an intimate state of division and admixture as to present the appearance of an actual chemical compound similar to the lead carbonate and lead hydroxid (hydrate) compound or composition of the so called White lead.

It will be noted that in the compound comprising lead aluminate that the percentage of lead in the compound over that in white lead or lead carbonate is reduced and the bulk of the paint increased by the employment ol' the aluminate and the product is tln-rctor much cheaper as to cost than white lead. while at the same time it yields a product of great superiority over the old form of lead carbonate and hydrate both as to spreading power and resistance to atmospheric decomposition. thereby pro- 'r *1 ,1] 1 i ducing a product which is more permanent The scdium acetate is washed out oi the in character.

It is obvious that the lead alunnnate may of lead aluminate per se, the lead aluminate Q i. V. #1.???9? 1..

be produced in any convenient mannerotlief thanthat described and that the pigment ma e associated with any selective ve-" I hic e In vproducing the amt'withoutdepart a ing from the spirit the invention which 1' broadly comprises as a new pigment or paint a metal alummate or its; equ1valent,.,or specifically'lead aluminate, or either as'sociated or combined with a metal hydroxid or hydrate, or specifically lead hydroxid or hydrate, or such compounds or compositions associated with a amt'vehicle, such as a:-

drying oil -(linse'e or the 's me' with a drier (turpentine -The so called white'rlead contain shadcompounds- :which are slightly soluble in water and produce a poisoning'efiectzwhen employed, to the painter, the maker,' "and the user, which is largely prevented if not 29 entirely avoided in the ma g, employment, and use of the less soluble lead alluminate m place of the lead carbonate which is contamed in white lead.

In=the manufacturing, shipping, anddisd pen'sing of mixed paints the lead aluminate pigment is of .great utility, that its lesser gravity, than white lead mamtanisv it in .a mixed or suspended; condition in the paint vehicle, thus avoiding the settlin' $9.0m; of the pigment to a greatj extent and yielding a more uniformly mixed paint and ma nta ned as such, whic is of greater utility, durability, spreading powerf-and practical utility, tha igments and paints of mixed character emp oye'd hitherto.

tuted for the lead hydroxid alumifiate' compound or ,compositiomisu'ch' as aluminium, zinc, or other "metal hydroxid.

It isflobvious that the metal of the allimi-fl nate may exist at any atomicity and the: ultimate may comprise the normal, basic, or other variety without departing fi-bmthe spirit of the-invention.

aving now described my invention what I claim as new anddesire to secure-by 1. A new pigment comprising lead alumi nat es 1;, .7 P .2 2; A aint'comprising lead aluminate and 59 fa vehice. 1 1 I i =3; A paint comprising at: 51.11,, in #5153; pm Oil. I T .x a I,

' "4. lupaintcomprising lead a drymgoil.

5. Apaint comprising lead 'aluminate, an oil, and a drier. I 6. A paintcomprising leadaluminate,

rying oil, and a drierv 7. A paint comprising lead aluminataja'n- 60;; oil, and turpentine. a f 8. A paint comprising lead aluminate, drying oil and turpentmev In testimony .rwher'eof I v v the presencepf two witnesses. 

